Active Voice
Don't worry! I (know) what I (do).
Don't worry! I know what I am doing.
A laptop and a printer (buy) for Timmy yesterday.
A laptop and a printer were bought for Timmy yesterday.
The fax will be received in an hour. (General)
Will the fax be received in an how?
He (leave) for London tomorrow night. You (see) him off?
He is leaving for London tomorrow night. Will you see him off?
Mr Bond thought that he (spy) on.
Mr Bond thought that he had been spied on.
She had cooked dinner by 5 o'clock yesterday. (Alternative: 6 o'clock)
Had she cooked dinner by 5 or 6 o'clock yesterday?
He (forget) his French since he (leave) Paris.
He has forgotten his French since he left Paris.
The guests (serve) in the restaurant at the moment.
The guests are being served in the restaurant at the moment.
My mother runs the house perfectly. (Special)
How (well) does your mother run the house?
When I (come in), she (set) the table.
When I came in, she was setting the table.
The local government (never criticize) by the citizens of this region.
The local government has never been criticized by the citizens of this region.
There are no chances to win the game. (Tag-question)
There are no chances to win the game, are there?
The police (not find) the burglar yet. They (look) for him since Saturday.
The police have not found the burglar yet. They have been looking for him since Saturday.
The article (write) by tomorrow.
The article will have been written by tomorrow.
Books give us a lot of knowledge. (Subject)
What gives us a lot of knowledge?